问题补充:
It shows that a knowledge of first aid can make a real.
A. effect
B. effort
C. importance
D. difference
答案:
A. effect
B. effort
C. importance
(答案→)D. difference
解析:考查固定结构。Make a difference起作用,有影响。句意:结果显示急救知识真的有很大作用。根据句意说明D正确。
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